Hi Isaiah, and Welcome to Gadgetmanland!
Well, until you are in a position to either get the GMC Grooved, or get a Personal Liscence Kit so you can do it yourself--try reading my post about my record-setting mileage run last week. Read here about the MPG Remedy and tire pressure tricks. Those two aren't expensive, and the tire press. gig you just need a decent tire press. guage and some common sense. I would like to see somebody try those two by themselves without the Groove.
I believe it has been noted that some engines/vehicles need to use MPG Remedy several tankfuls to see the improvements. The gains on my Subaru came in on the third then fourth tank, and now it runs like another car! Of course I have a Grooved Weber carb, very high energy ignition, ans some other mods too. But all the mods were in place for months/years, until the last two mileage tests. Only real change done in past several months was boosting my tire press. after I saw I had tires rated at 51 lbs. cold.
I look forward to seeing any results you may share w/ us!
I hope that you feel better in coming days/weeks, my freind!
Though I'm not a Veteran- I heartily say-
Semper Fi!
Hoo-ah!
Tracy G